> For the complete documentation index, see [llms.txt](https://support.powerio.com/hub/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://support.powerio.com/hub/codesys-hvac/en/hvac-modbus-library/functionblocks/schneider/schneider_iem3255.md). # SCHNEIDER\_IEM3255 ## `SCHNEIDER_IEM3255` (FB) `FUNCTION_BLOCK` SCHNEIDER\_IEM3255 ### Representation
InOut: | Scope | Name | Type | Initial | Comment | | ----------- | -------------------- | ------------------ | ------------- | ------------------------------------------------------------------------------------------------------------------- | | Input | `xEn` | `BOOL` | TRUE | Enable / disable communication (TRUE = enable) | | Input | `byUnitId` | `BYTE` | 0 | Address of the device | | Input | `xUpdateActual` | `BOOL` | FALSE |

Update of actual values (on every rising edge
)

| | Input | `xUpdateCounter` | `BOOL` | FALSE |

Update of the meter readings (on every rising
edge)

| | Input | `xUpdateInfo` | `BOOL` | FALSE |

Update of the serial number / device type (on every
rising edge)

| | Input | `xUpdateSetp` | `BOOL` | FALSE |

Update of setpoints (on every rising edge
)

| | Input | `rTariff` | `REAL` | 1.0 | Selection of the desired tariff (1 - 4 = Tariff 1 - Tariff 4) | | Input | `xResCounterPart` | `BOOL` | FALSE |

Reset of the partial energy counters (on every rising
edge)

| | Input | `xResError` | `BOOL` | FALSE |

Reinitialization of the outputs eErrorCodeCom on the
error-free state (on each rising edge)

| | Inout | `ModbusClient` | `ModbusClientBase` | | Client of the device | | Output | `rU1N` | `REAL` | | Phase voltage L1 - N in V | | Output | `rU2N` | `REAL` | | Phase voltage L2 - N in V | | Output | `rU3N` | `REAL` | | Phase voltage L3 - N in V | | Output | `rUXN_Avg` | `REAL` | | Phase voltage - average value in V | | Output | `rU12` | `REAL` | | Line voltage L1 - L2 in V | | Output | `rU23` | `REAL` | | Line voltage L2 - L3 in V | | Output | `rU31` | `REAL` | | Line voltage L3 - L1 in V | | Output | `rUXY_Avg` | `REAL` | | Line voltage - average value in V | | Output | `rIL1` | `REAL` | | Line current L1 in A | | Output | `rIL2` | `REAL` | | Line current L2 in A | | Output | `rIL3` | `REAL` | | Line current L3 in A | | Output | `rILX_Avg` | `REAL` | | Line current - average value in A | | Output | `rPowerFactorTot` | `REAL` | | Power factor - total in \[1] | | Output | `rActivePowerL1` | `REAL` | | Active power L1 in W | | Output | `rActivePowerL2` | `REAL` | | Active power L2 in W | | Output | `rActivePowerL3` | `REAL` | | Active power L3 in W | | Output | `rActivePowerTot` | `REAL` | | Active power - total in W | | Output | `rApparentPowerTot` | `REAL` | | Apparent power - total in VA | | Output | `rReactivePowerTot` | `REAL` | | Reactive power - total in var | | Output | `rFrequency` | `REAL` | | Frequency in Hz | | Output | `rActiveTariff` | `REAL` | |

Active tariff (0 = no multi-tariff, 1 - 4 = Tariff 1 - 4
)

| | Output | `rActEneImpTotal` | `REAL` | |

Imported active energy - total in kWh (non-resettable
)

| | Output | `rActEneExpTotal` | `REAL` | | Exported active energy - total in kWh (non-resettable) | | Output | `rReaEneImpTotal` | `REAL` | |

Imported reactive energy - total in kVarh (non-resettable
)

| | Output | `rReaEneExpTotal` | `REAL` | |

Exported reactive energy - total in kVarh (non-resettable
)

| | Output | `rActEneImpPart` | `REAL` | | Imported active energy - partial amount in kWh (resettable) | | Output | `rReaEneImpPart` | `REAL` | |

Imported reactive energy - partial amount in kVarh (resettable
)

| | Output | `rActEneImpP1` | `REAL` | | Imported active energy - Phase 1 in kWh (resettable) | | Output | `rActEneImpP2` | `REAL` | | Imported active energy - Phase 2 in kWh (resettable) | | Output | `rActEneImpP3` | `REAL` | | Imported active energy - Phase 3 in kWh (resettable) | | Output | `rActEneImpTotT1` | `REAL` | |

Imported active energy - total - Tariff 1 in kWh (
resettable)

| | Output | `rActEneImpTotT2` | `REAL` | |

Imported active energy - total - Tariff 2 in kWh (
resettable)

| | Output | `rActEneImpTotT3` | `REAL` | |

Imported active energy - total - Tariff 3 in kWh (
resettable)

| | Output | `rActEneImpTotT4` | `REAL` | |

Imported active energy - total - Tariff 4 in kWh (
resettable)

| | Output | `dwSerialNum` | `DWORD` | | Meter serial number | | Output | `sDeviceName` | `STRING` | | Meter name (20 UTF8 characters) | | Output | `sDeviceType` | `STRING` | | Meter type (20 UTF8 characters) | | Output | `xAlarm` | `BOOL` | FALSE | Collective fault (TRUE = fault) | | Output | `xAlarmCom` | `BOOL` | FALSE | Collective fault - communication (TRUE = fault) | | Output | `eErrorCodeCom` | ModbusErrorCode | | Error code - communication (0 = no error) | | Output | `xBusy` | `BOOL` | | Communication indicator (TRUE = communication) | | Input Const | `diAdrOffset` | `DINT` | -1 |

Offset for calculating the Modbus addresses (from the Modbus
registers) (permitted range: -1, 0, +1)

| | Input Const | `tTimeUpdateSetp` | `TIME` | TIME#45s0ms |

Update interval for the operations that are influenced by the input
xUpdateSetp influenced

| | Input Const | `tTimeUpdateCounter` | `TIME` | TIME#60m0s0ms | Update interval for the meter readings (Istwerte\_2) | | Input Const | `tTimeUpdateActual` | `TIME` | TIME#1m0s0ms |

Update interval for the operations that are influenced by the input
xUpdateActual influenced

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